Experimental study of interaction of twin liquid jets on stationary and moving surfaces

Abstract

The interaction between twin liquid jets impacts the heat transfer at interaction region. In this paper, the interaction of twin circular free surface long water jets with typical industrial parameters impinging on stationary and moving target surfaces is experimentally studied. Jets flow rate and substrate speed were systematically changed to assess radial developments of wetting front, interaction of wall jets and contours of hydraulic jumps. At stationary surface, distant jets produced thick interaction films and adjacent jets created upwash splashing thin fountains. On moving surface, same interaction types were obtained when the surface speed was slow and/or the jets flow rate is high enough to maintain the original jets interactions. However, the surface motion can principally change flow characteristics of interaction zone from strong splashing upwash fountain to oscillating nonsplashing dome-shape interaction if the surface motion has dominant effect, i.e. lower jet flow rate and/or higher plate speed. The surface speed and jet flow that determine jets interaction behaviour were experimentally found.